For mobile game developers, the battle is about acquiring users who hopefully pay the bills. But it’s not just about targeting the US or a couple of markets; it’s increasingly about looking around the world.

Chartboost, a mobile advertising marketplace for game developers, is helping shed some light on where the opportunities are in acquiring users by providing comparative data on cost-per-clicks versus cost-per-installs in various countries. The numbers might not be a surprise to someone paying attention to a particular country but the larger picture is helpful in understanding what the global market looks like.

At the top of the market for cost per installs is Australia and Canada, which is ahead of the US. That’s likely because many app developers test their apps in those countries before expanding to the US and other markets. But because they’ve become popular for testing, those countries have become expensive places to…